1 files changed, 32 insertions, 0 deletions
diff --git a/libmailutils/datetime/jd.c b/libmailutils/datetime/jd.c
new file mode 100644
index 000000000..39fdf8014
--- /dev/null
+++ b/libmailutils/datetime/jd.c
@@ -0,0 +1,32 @@
+/* GNU Mailutils -- a suite of utilities for electronic mail
+   Copyright (C) 2011 Free Software Foundation, Inc.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 3 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General
+   Public License along with this library.  If not, see
+   <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+#include <stdlib.h>
+#include <mailutils/datetime.h>
+
+int
+mu_datetime_julianday (int year, int month, int day)
+{
+  int a = (14 - month) / 12;
+  int y = year + 4800 - a;
+  int m = month + 12*a - 3;
+
+  return day + (153*m + 2)/5 + 365*y + y/4 - y/100 + y/400 - 32045; 
+}